Originally Posted by
nabob
It's interesting that another type of matrix number S4RS-0712 and S4RS-0713 appear in the vinyl outside the labels on both pressings. This system was used to indicate approximately when the albums were mastered. The "S" represents 1965 and the "4" represents the first half of the year. An album mastered in the latter half of 1964 would have borne the sequence starting as RS4S or RM4M. At the end of the alphabet, the system was started again as A5RS. The system was tracked through 1975 and may have extended longer, but between failing eyesight for fine print and not wanting to make a thesis of the project, the search was suspended.
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